McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Chapter 12 Point-to-Point Access: PPP

McGraw-Hill©The McGraw-Hill Companies, Inc., Point-To-Point Protocol Frame Format Transition States

McGraw-Hill©The McGraw-Hill Companies, Inc., PPP frame

McGraw-Hill©The McGraw-Hill Companies, Inc., Transition states

McGraw-Hill©The McGraw-Hill Companies, Inc., PPP Stack Link Control Protocol (LCP) Authentication Protocols Network Control Protocol (NCP) Bit Padding Digital Signals (DS) Services

McGraw-Hill©The McGraw-Hill Companies, Inc., Protocol stack

McGraw-Hill©The McGraw-Hill Companies, Inc., LCP packet encapsulated in a frame

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Table 12.1 LCP packets and their codes CodePacket TypeDescription Configure-request Contains the list of proposed options and their values Configure-ack Accepts all options proposed Configure-nak Announces that some options are not acceptable Configure-reject Announces that some options are not recognized Terminate-request Requests to shut down the line Terminate-ack Accepts the shut down request Code-reject Announces an unknown code Protocol-reject Announces an unknown protocol Echo-request A type of hello message to check if the other end is alive 0A 16 Echo-reply The response to the echo-request message 0B 16 Discard-request A request to discard the packet

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Table 12.2 Common options OptionDefault Maximum receive unit1500 Authentication protocolNone Protocol field compressionOff Address and control field compressionOff

McGraw-Hill©The McGraw-Hill Companies, Inc., PAP

McGraw-Hill©The McGraw-Hill Companies, Inc., PAP packets

McGraw-Hill©The McGraw-Hill Companies, Inc., CHAP

McGraw-Hill©The McGraw-Hill Companies, Inc., CHAP packets

McGraw-Hill©The McGraw-Hill Companies, Inc., IPCP packet encapsulated in PPP frame

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Table 12.3 Code value for IPCP packets CodeIPCP Packet 01Configure-request 02Configure-ack 03Configure-nak 04Configure-reject 05Terminate-request 06Terminate-ack 07Code-reject

McGraw-Hill©The McGraw-Hill Companies, Inc., An example